-90.81% is the change from 860 to 79
Calculation steps:
[( 79 - 860 ) ÷ 860] x 100 = -90.81%
Formula
Percentage change = [(79 - 860) / 860] x 100
Subtract the new number by the original number
79 - 860 = -781
-781 ÷ 860 = -0.9081395348837209
-0.9081395348837209 x 100 = -90.81%